Forces Review

How does a continental plate demonstrate Newton's law of inertia?

• A continental plate will continue to move until it cracks from the pressure applied by Earth's atmosphere.

• A continental plate will continue to move until it crashes into or slides against another continental plate.

• A continental plate will continue to move until it melts into molten rock from the heat of the Sun.

• A continental plate will continue to move until it travels back to its original location on Earth's surface.

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

Two shoppers grab the same box with a discounted flat screen TV inside. Each shopper grabs one end of the box and starts pulling the box toward himself. In an attempt to get the TV, the shoppers end up in a standoff, where the box is not moving toward either shopper. What caused the standoff between the shoppers?

• The force of friction

• Balanced forces

• The force of gravity

• Unbalanced forces

Tags

NGSS.MS-PS2-2

The picture below shows the space shuttle leaving Earth. How is the space shuttle able to leave Earth's surface?

• The space shuttle's engines create an upward force greater than the downward force of gravity.

• The space shuttle's engines create a downward force greater than the upward force of gravity.

• The space shuttle's engines create an upward force less than the downward force of gravity.

• The space shuttle's engines create a downward force less than the upward force of gravity.

Tags

NGSS.MS-PS2-2

An elevator is being pulled up from the ground floor to the third floor by a cable. The cable is exerting 4500 newtons of force on the elevator. According to Newton's law of action-reaction, what is the gravitational force on the elevator and the people in it, in newtons, if the elevator is not accelerating?

• 4500

• 4000

• 5000

• 3500

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

A boat with a jet engine demonstrates Newton's law of action-reaction. Why is this true?

• As the boat expels exhaust forward, the boat remains stationary.

• As the boat expels exhaust backward and forward, the boat remains stationary.

• As the boat expels exhaust forward, the boat moves forward.

• As the boat expels exhaust backward, the boat moves forward.

Tags

NGSS.MS-PS2-1

The diagram below shows a man fastened in a car seat while driving. Based on Newton's law of action-reaction, which arrow represents the force that the seat belt would exert on the man's body if he had to slam on the brakes?

• W

• X

• Y

• Z

Tags

NGSS.MS-PS2-1

Eva and Morgan are comparing the weights of their blueberries and raspberries on the balance shown below. Eva's blueberries weigh slightly more than Morgan's raspberries. As a result, the left pan is moving downward, and the right pan is moving upward. Three blueberries fall from the left pan as it is moving. As a result, the right pan now weighs more than the left pan. How does the motion of the balance change after the blueberries fall from the left pan?

• Both pans will stop moving.

• Both pans will become even.

• The right pan will move upward, and the left pan will move downward.

• The right pan will move downward, and the left pan will move upward.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

Unbalanced forces –

• cause the motion of an object to change.

• allow an object to remain at rest.

• are always greater than the force of gravity.

• cancel each other out to a net force of zero.

Tags

NGSS.MS-PS2-2

The diagram models the forces acting on a box. Which of the following best describes the motion of the box?

• The box is moving downward with increasing speed.

• The box is moving with constant speed to the right.

• The box is moving with constant speed to the left.

• The box is moving upward with increasing speed.

Tags

NGSS.MS-PS2-2

Two teams are competing in a game of tug-of-war. Both teams are pulling with a force of 2300 newtons. What will happen if the team on the left makes an extra effort and pulls the rope with a force of 2330 newtons?

• The team on the left will be able to pull the other team to the left at a constant speed.

• The team on the right will be able to pull the other team to the left at a constant speed.

• The team on the left will be able to pull the other team to the left at an increasing speed.

• The team on the right will be able to pull the other team to the right at an increasing speed.

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2